Full game metadata
| Field | Value |
|---|---|
| Steam app type | game |
| Steam App ID | 4495530 |
| Live current players | 0 |
| SteamPulse tracked peak | 1 |
| Live count (today's peak floor) | 0 |
| Price | Free to play |
| Free to play | Yes |
| Discount | 0% |
| Original price USD | — |
| Current price USD | Free |
| Release date | Jun 28, 2026 |
| Developer | Fermat Freaks co., Ltd |
| Publisher | Fermat Freaks co., Ltd |
| Owners estimated | Not available |
| SteamSpy owner estimate minimum | Not available |
| SteamSpy owner estimate maximum | Not available |
| Review type | 3 user reviews |
| Positive review percent | 67% |
| Positive reviews | 2 |
| Negative reviews | 1 |
| Total reviews | 3 |
| Steam recommendations | Not available |
| Achievements | 90 |
| Average playtime forever | Not available |
| Windows support | Yes |
| macOS support | No |
| Linux support | No |
| Parent game | Not available |
| Store URL | https://store.steampowered.com/app/4495530/ |
Short description
"If it's even, halve it. If it's odd, triple it and add one." This single rule transforms into a brain-melting, high-speed action game. Based on the Collatz Conjecture—math's greatest unsolved mystery—comes a brand-new reflex-testing roguelike!
About this game
Beat a mathematical enigma with pure reflexes. The Collatz Conjecture—an incredibly simple yet maddeningly complex puzzle that has baffled the world’s greatest minds for decades, derailing the lives of brilliant mathematicians. While geniuses lose their minds at their desks, “Ichi,” the muscle-brained magical girl, takes on this unsolved mystery in the only way she knows how. Monsters relentlessly fire “Magic Numbers” at you. Instantly teleport between lanes—upper for even numbers [↑], lower for odd numbers [↓]. Read the incoming digits in a split second, charge your shot, and smash them back. One wrong move in this extreme reflex battle can be fatal. But when massive numbers finally collapse into a single “1,” Ichi’s magic spirals completely out of control. Geniuses will keep fighting this unsolved mystery with their brains. As for us? We’re taking it on with gamer reflexes. ◆ Brain-Melting "Even/Odd" Action ━━━━━━━━━━━━━━━━━━━━━━━━━━ Enemies will unleash a relentless barrage of numbers. Instantly determine if they are even or odd and strike back with the correct magic. Chain correct answers to multiply your power, reduce the enemy's number to "1", and obliterate them with a devastating Finisher! ◆ Perfect Parries & Just Defense ━━━━━━━━━━━━━━━━━━━━━━━━━━ Don't just take the hits. Read the trajectory of enemy attacks and strike back at the exact right moment to turn the tide of battle. When backed into a corner, unleash the "Auto-Parry" to survive impossible bullet hells. ◆ Death, Rebirth, and Grimoires ━━━━━━━━━━━━━━━━━━━━━━━━━━ Death is not the end. Return to "Heaven" and use your collected currency to permanently upgrade your stats. Discover and equip over 10 different Grimoires (magic books) with unique effects to continuously push your abilities to the limit. ◆ The Mystery of the Endless Calculation ━━━━━━━━━━━━━━━━━━━━━━━━━━ You play as "Ichi", an amnesiac protagonist. Why must she fight? And what truly awaits her at the end of this endless calculation...? ◆ 90 Achievements ━━━━━━━━━━━━━━━━━━━━━━━━━━ Track your mastery across 9 categories, including Max Combos, Highest Floor Reached, and Max Damage. Can you unlock all 90 achieveme…
Supported languages
English, Japanese, Simplified Chinese, Traditional Chinese